/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.skatiger.jrove.component;

import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;

class _FacetsAndChildrenIterator
        implements Iterator<UIComponent> {
    private Iterator<UIComponent> _facetsIterator;
    private Iterator<UIComponent> _childrenIterator;

    _FacetsAndChildrenIterator(Map<String, UIComponent> facetMap, List<UIComponent> childrenList) {
        _facetsIterator = facetMap != null ? facetMap.values().iterator() : null;
        _childrenIterator = childrenList != null ? childrenList.iterator() : null;
    }

    public boolean hasNext() {
        boolean hasNext = (_facetsIterator != null && _facetsIterator.hasNext())
                || (_childrenIterator != null && _childrenIterator.hasNext());
        if (!hasNext) {
            _facetsIterator = null;
            _childrenIterator = null;
        }
        return hasNext;
    }

    public UIComponent next() {
        if (_facetsIterator != null && _facetsIterator.hasNext()) {
            return _facetsIterator.next();
        } else if (_childrenIterator != null && _childrenIterator.hasNext()) {
            return _childrenIterator.next();
        } else {
            throw new NoSuchElementException();
        }
    }

    public void remove() {
        throw new UnsupportedOperationException(this.getClass().getName() + " UnsupportedOperationException");
    }

}
